For me, there are 3 main uses for the perks:
1. SC troop donate limit increase. There is one perk that allows for +3 troops, and 2 perks that allow for +1 troop each. The way I used them, is to rotate between the +3 and the two +1 together as my SC troop request typically doesn’t need more than 6. i.e when the +3 perk was under cool down period, then I used the two +1 perks, and vice versa.
2. Droideka repair time decrease. There are 3 perks that together can reduce repair time by 40%
3. Reduce planet move star requirement. I used 2 perks to reduce star requirement down to 0. This is useful when doing: (1) hero defense and (2) crate objectives. For the crate objectives, if you have one planet with a donate crate and another planet with a receive crate then you can jump between the planets just before you donate or receive troops. Similarly, if you have a planet with a troop training and another planet with troop deploying, then you train troops on one planet then move to the other planet to deploy them. Other use is when I needed to loot CBs or doing the event loot objective
A another use is when my credit vaults were full and droids were busy, the I burned credits to increase alloy production.